On Feb 29, 2008, at 10:33 PM, Quincey Morris wrote:
A couple of small points:
-- It's not quite correct to use the superview's frame to calculate
a view's frame, since they are in different coordinate systems. You
really should use [[self superview] bounds], which is in the same
coordinate system as [self frame].
The problem is harmless in this case, because the superview is a
NSClipView, which happens to keep its frame coordinate system
synchronized with that of view it contains, but this is not
generally true of view-superview geometry.
-- If you want to refer to the clip view, [[self
enclosingScrollView] contentView] is more correct than [self
superview]. The fact that they're the same thing is an
implementation detail. (But if you're going to pretend not to know
they're the same you really should do an explicit coordinate
conversion when combining their dimensions.)
-- As someone suggested on this list a few weeks ago, it's perhaps
marginally more elegant to use [self visibleRect] instead of the
clip view bounds. Although the purpose of the clip view is to manage
the visible rect of the view it contains, using the visible rect
directly means you don't have to build in knowledge of that
implementation detail. And there's no coordinate conversion needed.
Thank you. All very helpful information. I have incorporated the
changes, added origin offsetting to keep things central, and it works
perfectly. The last change I made was to manually send the
notification once the content parameters were set up. That ensured
that the scrollers appeared when the window was first created.
--
Blog: http://www.bagelturf.com/ Photos: http://bagelturf.smugmug.com/
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